The thyroid gland (Latin: Glandula thyr(e)oidea; English: Thyroid) is a very important gland in vertebrates and belongs to the endocrine organs. In mammals it is located in the neck below the thyroid cartilage and on either side of the trachea. In humans, the thyroid gland is shaped like a butterfly and resembles a shield armor, hence the name. The thyroid gland controls the rate at which energy is used, makes proteins, and regulates the body’s sensitivity to other hormones. The thyroid gland relies on the production of thyroxine to regulate these responses, and has triiodothyronine (T3) and thyroxine, which may also be called tetraiodothyronine (T4). T3 and T4 are synthesized from iodine and tyramine. The thyroid gland also produces calcitonin, which regulates calcium balance in the body. The incidence of thyroid cancer has increased significantly in recent years and is more common in women. The following signs are common in the early stages of thyroid cancer: 1) a painless mass in the neck that gradually increases in size; 2) hoarseness and difficulty in pronunciation; 3) difficulty in swallowing; 4) difficulty in breathing; 5) coughing and coughing up blood; 6) generalized bone pain. If you see the above adverse symptoms, it is recommended to go to the hospital for further examination.